Checking For Open-Circuits And Short-Circuits

Check that the fuses in the fusebox in the passenger compartment are intact.

Check the cable between control module terminal #21 and siren terminal #2. Check for a short-circuit to ground. Check for an open-circuit. Check for a short-circuit to supply voltage.

Check the wiring from the fuse in the passenger compartment to siren connector terminal #1. Check for an open-circuit. Check for a short-circuit to ground.

Other information: 

• For further information about signals and other values, see SIGNAL DESCRIPTION, UPPER ELECTRONIC MODULE (UEM)
• To connect the breakout box, see CONNECTING THE BREAKOUT BOX
• see SIREN, REPLACING 
• see CHECKING WIRING AND TERMINALS .

Remedy as necessary.

Fig 1: Identifying Connector Terminals

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying Ohms Display

Courtesy of VOLVO CARS CORPORATION

Fig 3: Locating Fuse Holder (Passenger Compartment)

Courtesy of VOLVO CARS CORPORATION

Was a fault detected? 

• YES 

  see VERIFICATION 

• NO 

  see REPLACING THE COMPONENT